Rapid Depigmentation serum

UPDATE- I actually went back to this because I went back to using a Clarisonic with the deep pore cleansing brush head. The product then started to absorb instead of sitting on the surface and...

Rapid? I used it faithfully every morning and night for 2 months and didn't see any sign of change in a sun spot that I have on my cheek. I give it 2 stars instead of one because it doesn't smell...